In a soda company, the bottles are filled exactly 90 + 15 ml. The bottles outside this bound are considered as defective, and the bottles' weight is normally distributed. The manufacturing engineer claims that the products meet this requirement at least 99%. If the population mean is 90 and the standard deviation is 10, what portion of the bottles is defective?
If the manufacturing targets are not met, what would you do to meet the required accuracy?